After first disappointment I started to find solution, as sending unit back to China wasn't too good idea -- huge freight cost and long waiting time. And my searches were successful.
TWO main issues found:
1. Avoid using "Auto" setting in "Network" setting, use 10/100. For some reason my 15m long Gigabit cable didn't guarantee flawless 1Gb connection and instead of falling back to 100 Mbit, C-200 went crazy;
2. I had to abndon my beloved TwonkyMedia server and move over to Syabas MyiHome 5.2.0 streaming server. It has hugely better compatibility with Network Media Tank system than Twonky.
More notes
1. Chassis of C-200 is sligthly narrower than my std A/V equipment, like Onkyo TX-SR706
PA C-200 425 mm
TX-SR706: 435 mm
So, it's 1 cm narrower. As I don't put anything ontop Onkyo to avoid overheating (this is issue with Onkyo AV equipment!), C-200 has to be below and it doesn't look cool.
2. Installing internal HDD and sharing it to home network is super easy and works well. It's good idea to keep all hot new albums on C-200 HDD to use it autonomically. May-be in the future I will abandon my dedicated streaming server at all?
3. Speed has increased many times due to 2x faster processor and double memory. It really flies now through the menus and media directories.
4. RF remote (its not IR) has pro's and con's. It is really usable, absolutely no need to point it to the device, obstacles are not issue any more. But I can't use now my universal IR remote. Popcorn has solution for that, obtaining IRK-200 kit.
Issues not solved
1. Selecting 1080i resolution from screen settings menu generates bad whistle in left speaker. Have to use 720p, as my 41" plasma is not supporting 1080p.